According to the Miami Beach Police report ... Chief was booked Saturday for felony DUI after he failed a sobriety test when he and another vehicle were stopped for what appeared to be a weed transfer. Cops also found a cup full of "sizzurp" ... the codeine-laced drink Lil Wayne's always rapping about. (TMZ)

Law enforcement sources tell us Keef was driving a green Lamborghini when his passenger allegedly got out and started talking with the vehicle behind theirs. We're told cops saw the commotion and believed there was an exchange made, initiating a stop. Witnesses on scene tell us officers discovered marijuana in at least one of the vehicles. At this time, we're told Keef and 4 others have been brought in for questioning ... but he hasn't been officially booked or charged with anything. (TMZ)

The Chicago man was accused of assaulting his former music producer and was arrested by Los Angeles police. Chief Keef allegedly robbed the producer of a Rolex, rings and $1,600 in cash, while being armed with an assault rifle on January 19. Ramsay Tha Great said in the video that he was woken up by someone at his door and Chief Keef and another man who was armed with an assault rifle, pushed their way inside his room. (Daily Mail)